[preview] Add flatpak manifest and metainfo

flatpak/org.gajim.Gajim.Plugin.url_image_preview.json

@@ -0,0 +1,53 @@
+{
+    "id": "org.gajim.Gajim.Plugin.url_image_preview",
+    "runtime": "org.gajim.Gajim",
+    "sdk": "org.gnome.Sdk//3.28",
+    "build-extension": true,
+    "separate-locales": false,
+    "appstream-compose": false,
+    "build-options": {
+        "env": {
+            "PYTHONPATH": "/app/plugins/url_image_preview/lib/python3.5/site-packages/"
+        }
+    },
+    "modules": [
+        {
+            "name": "python3-pillow",
+            "buildsystem": "simple",
+            "build-commands": [
+                "install -d ${FLATPAK_DEST}/lib/python3.5/site-packages/",
+                "python3 setup.py install --prefix=${FLATPAK_DEST}"
+            ],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://files.pythonhosted.org/packages/89/b8/2f49bf71cbd0e9485bb36f72d438421b69b7356180695ae10bd4fd3066f5/Pillow-5.1.0.tar.gz",
+                    "sha256": "cee9bc75bff455d317b6947081df0824a8f118de2786dc3d74a3503fd631f4ef"
+                }
+            ]
+        },
+        {
+            "name": "gajim-url_image_preview",
+            "buildsystem": "simple",
+            "build-commands": [
+                "cp -R -t ${FLATPAK_DEST} *"
+            ],
+            "post-install": [
+                "install -Dm644 --target-directory=${FLATPAK_DEST}/share/metainfo org.gajim.Gajim.Plugin.url_image_preview.metainfo.xml",
+                "appstream-compose --basename=org.gajim.Gajim.Plugin.url_image_preview --prefix=${FLATPAK_DEST} --origin=flatpak org.gajim.Gajim.Plugin.url_image_preview"
+            ],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://ftp.gajim.org/plugins_releases/url_image_preview_2.2.0.zip",
+                    "sha256": "1f2f0f908e7c493fa153f7cf513f598807978b7ebdc7af9fad232d95023b4fd3"
+                },
+                {
+                    "type": "file",
+                    "path": "org.gajim.Gajim.Plugin.url_image_preview.metainfo.xml",
+                    "sha256": "3babf6d51115b18c8743c9a78ff7fbd66338c496376ae24a217085ae1543ef0b"
+                }
+            ]
+        }
+    ]
+}

flatpak/org.gajim.Gajim.Plugin.url_image_preview.metainfo.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="addon">
+  <id>org.gajim.Gajim.Plugin.url_image_preview</id>
+  <extends>org.gajim.Gajim.desktop</extends>
+  <name>URL Image Preview Plugin</name>
+  <summary>Display a preview of links to images</summary>
+  <url type="homepage">https://gajim.org/</url>
+  <metadata_license>CC-BY-SA-3.0</metadata_license>
+  <project_license>GPL-3.0</project_license>
+  <update_contact>gajim-devel_AT_gajim.org</update_contact>
+</component>
+